How to hold taps for CNC rigid tapping.
On 2011-03-13, Karl Townsend wrote:
On Sat, 12 Mar 2011 23:03:37 -0600, Ignoramus25538
wrote:
My CNC mill does rigid tapping and it is great and easy to do -- just
one "one liner" like this
G33.1 Z[-0.5] K[1/24]
would rigid tap a 24 TPI thread from the current point to the depth -0.5.
Easy and powerful.
It even works great with fine threads, but I have a problem with
coarse threads. I hold the taps in a Jacobs drill chuck. The chuck
cannot hold a coarse tap, like 1/4-20, the tap slips in the chuck. The
result, is holes that are partially tapped and a slipping tap. Not the
end of the world, but I want to do better.
What kind of tool holder should I use for this rigid tapping? Would
colleted tool holders help with this?
i
A drill chuck is a REAL POOR choice. Slips easy and isn't on center. I
normally use my TG100 collet holder and the right diameter collet.
Tighten up real good. Slipping is a BAD thing.
Karl, what about ER type collets?
P.S. Does your control have Q for peck tapping? Or R for start plane?
Is it modal so you can just enter points to tap after first command?
I know that RT uses index pulse to re-enter previously tapped
holes. That should do what you are talking about.
i
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